Поставте пожалуйста перед какими-то словами артикль the
I live in the russian federation. Russia is largest country.There are many mountains there: Aips, Everest, Pamirs, Elbrus,Urals. My town Gorokhovets is small. It stands on river Klyazma. I want to visit United Kingdom.

перед United Kingdom всегда the пишется вроде

I live in the russian federation. Russia is  the largest country.There are many mountains there: Aips, Everest, the Pamirs, Elbrus,the Urals. My town Gorokhovets is small. It stands on river the Klyazma. I want to visit United Kingdom.во всем не уверенна